Improvement in slide-valves for steam-engines



r .54 Mfr Patented Nov.`l"l, 187,3, 4

a Jlyy @n e /////////////f,

Wulff @i E:

w. L'ovE. Slide-Valves 4fur Steam-Engines;

l No; 144,463

NITED STATES PATENT OFFICE'.

WILLIAM LOVE, OF BUFFALO, NEW YORK.

IMPROVEMENT IN SLIDE-VALVES FOR STEAM-ENGINESQ Specification formingpart of Letters Patent No. 144,463, dated November 11, 1.873;application iiled v July 30, 1873.

To all whom it may concern:

Be it known that I, WILLIAM LOVE, of the city of Buffalo, in the countyof Erie and State of New York, have invented certain Improvements inSlide-Valves for Steam-Engines, of which the following is aspeciiication:

My invention relates to that class of slidevalves which con sist of ,twotightly packed steam-pistons, operating in conjunction with circularports, and which are commonly desig nated as piston-valves and theinvention consists of a hollow piston-valve provided withsteam-passages, so that the steam passes from the interior or cavity ofthe valve through said passages to the circular ports, whereby a greaterbearingsurface of each piston is obtained, with out increasing thestroke of the valve.

In the accompanying drawing, Figure l is a longitudinal section of myimproved valve arranged in the steam-chest. Figs. 2 and 3 are crosssections in line x x and y y, Fig. l, respectively. Fig. 4 is aperspective view of my improved valve.

Like letters of reference designate like parts in each of the figures.

A represents the steam-chest, of cylindrical form, and closed at theends by heads a a, proyided with stuffing-boxes, through which passesthe valve-rod b. c represents the cylindrical valve-seat, and d thecircular steam ports arranged therein, and forming a continuation ofcylinder-ports c e. f is the steamsupply passage, arranged between theports d d; and o o, the steam-exhaust passages, arranged outside of theports d d, or between the latter and the heads a a of the steam-chest. GG represent the two hollow valve-pistons, each consisting of a soliddisk or piston, g, iitting steam-tight in the valve-seat c, and a hollowcylindrical extension, h, provided with a number of steam-passages, t',arranged in anl inlet passage f, so that the steam passes from thelatter into the cavity of each piston G, and

thence, through the openings i, into the respective steam-ports, asindicated by the arrow l in Fig. l. Steam is admitted to thecylinder-ports as soon as the inner edge of the solid portion g of eachvalve opens the port, and the exhaust commences as soon as the outsideedge of the solid portion g opens the port, as shown by the arrow 2,Fig. l, in the sameV manner as in an ordinary solid pistonvalve. Hence,in my improved valve, the stroke is the same as in the ordinary solidvalve, while the bearing-surface thereof is greatly in creased by theextension h, whereby the wear is reduced, binding of the pistons intheir seats prevented, and a smoother movement produced. The solidportion g of each valve-piston is provided with packing-rings` ofsuitable construction, and the circular ports d are constructed withbridge-pieces k,'to prevent said packing-rings from expanding into saidports when they pass over the same. The pistons G G are adjustablyattached to the rod b by set-screws, or in any other suit` able manner.

What I claim as my invention is- The piston -valve G, provided with theho1- lowr extension h and steam-passages t', in com-` bination with thecircular ports el, substan tially as hereinbefore set forth.

WM. LOVE.

Witnesses Giras. L. WHITING, JNO. J. BONNER.

